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Polyvinyl acetate latex

a technology of polyvinyl acetate and latex, applied in the direction of biocides, antifouling/underwater paints, coatings, etc., can solve the problems of limiting the marketability of latex, adding unnecessary shipping and handling costs, and causing great challenges in processing and manufacturing

Inactive Publication Date: 2016-06-23
ROHM & HAAS CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a process for making a type of polymer called vinyl acetate. This process uses a special chemical called a hypophosphite salt or X—R1—SH, where R1 is a specific kind of alkyl group and X is sulfonate, hydroxyl, sulfate, phosphate, phosphonate, carboxylic acid, or a salt of these. By using this special chemical, the process can make vinyl acetate with lower viscosities at higher levels of polymerization. This can be useful for making certain types of vinyl acetate polymers and copolymers.

Problems solved by technology

Historically, polyvinyl acetate containing latexes develop high in-process viscosities, which present great challenges to processing and manufacturing.
Failure to reduce in-process viscosity often forces latex manufacturers to either use extreme agitation, which may present safety issues in a plant, or to reduce polymer solids, which adds unnecessary cost for shipping and handling.
Furthermore, low solid content latexes limit the marketability of the latex.

Method used

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Examples

Experimental program
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Effect test

example 1

Preparation of PVA Copolymer Sodium hypophosphite Chain Transfer Agent

[0017]The monomer emulsion was prepared by first mixing DI water (2258 g), a sodium hypophosphite solution (26.5 g, 45% aq), phosphoethyl methacrylate (60% active, 230.85 g), NaOH (50%, 151 g), Disponil FES-77 surfactant (185.37 g), TERGITOL™ 15-S-40 surfactant (169.2 g), and dodecylbenzene sulfonate (22.5% aq., 220.35 g) followed by BA (1255.21 g), VA (9810.90 g) and Lubrizol AMPS 2405 (259.7 g).

[0018]A 5-gal (19-L) reactor equipped with a mechanical stirrer, nitrogen gas blanket, thermometer, condenser, heating mantel and temperature controller was charged with deionized water (9160 g) and heated to 71° C. while purged with N2. To this flask were added Disponil FES-32 surfactant (250.08 g), TERGITOL™ 15-S-40 surfactant (169.2 g), and a solution of FeSO4 heptahydrate (0.36 g) in water (20 g). Co-feed catalyst solution t-BHP (37.1 g) in water (449 g) and a co-feed solution of IAA (51.08 g) and sodium acetate (35.6...

example 2

Preparation of PVA Copolymer with Sodium hypophosphite Chain Transfer Agent

[0019]The monomer emulsion was prepared by first mixing DI water (2258 g), a sodium hypophosphite solution (26.5 g, 45% aq), PEM (60% active, 230.85 g), NaOH (50%, 151 g), Disponil FES-77 surfactant (185.37 g), TERGITOL™ 15-S-40 surfactant (169.2 g), and dodecylbenzene sulfonate (22.5% aq., 220.35 g) followed by BA (1255.21 g), VA (9810.90 g) and Lubrizol AMPS 2405 (259.7 g).

[0020]A 5-gal (19-L) reactor equipped with a mechanical stirrer, nitrogen gas blanket, thermometer, condenser, heating mantel and temperature controller was charged with deionized water (8100 g) and heated to 71° C. while purged with N2. To this flask were added Disponil FES-32 surfactant (250.08 g), TERGITOL™ 15-S-40 surfactant (169.2 g), and a solution of FeSO4 heptahydrate (0.36 g) in water (20 g). Co-feed catalyst solution t-BHP (37.1 g) in water (449 g) and co-feed solution of IAA (51.08 g) and sodium acetate (35.67 g) in water (482....

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Abstract

The present invention relates to a process for preparing an aqueous dispersion of a vinyl acetate polymer comprising the step of polymerizing vinyl acetate under emulsion polymerization conditions in the presence of a chain transfer agent which is a hypophosphite salt or X—R1—SH, where R1 is a C1-C4 alkyl group and X is sulfonate, hydroxyl, sulfate, phosphate, phosphonate, carboxylic acid or a salt thereof, or C1-C3-alkyl carboxylate. The process provides a way of lowering the viscosity of the vinyl acetate polymer at a given solids content.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to a polyvinyl acetate latex composition, more particularly, a relatively low viscosity polyvinyl acetate latex composition.[0002]Historically, polyvinyl acetate containing latexes develop high in-process viscosities, which present great challenges to processing and manufacturing. Failure to reduce in-process viscosity often forces latex manufacturers to either use extreme agitation, which may present safety issues in a plant, or to reduce polymer solids, which adds unnecessary cost for shipping and handling. Furthermore, low solid content latexes limit the marketability of the latex. Accordingly, it would advantageous to develop polyvinyl acetate latexes with higher solids and / or lower viscosities.SUMMARY OF THE INVENTION[0003]The present invention is a process for preparing an aqueous dispersion of a vinyl acetate polymer comprising the step of polymerizing vinyl acetate under emulsion polymerization conditions in the ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08L31/04
CPCC08L31/04C08F218/08C08F220/1804C08F230/02
Inventor BOHLING, JAMES C.BESHAH, KEBEDELUO, PU
Owner ROHM & HAAS CO